JP2551274Y2 - Hoisting rope support device of bridge crane - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bridge type crane having a boom that moves up and down at the front end of a girder and a trolley moving along the girder, and more particularly to a rope trolley type bridge having a slack preventing mechanism for a hoisting rope. Field of the Invention The present invention relates to a hoisting rope support device for a mobile crane.

[0002]

2. Description of the Related Art In a so-called long-reach / back-reach bridge crane, the amount of hanging of a hoisting rope increases depending on the position of a trolley that moves on a girder while holding a lifting device, and operability deteriorates. A rope supporting cart (sub trolley) for preventing the rope from hanging is provided on the front and rear sides of a trolley (main trolley) for moving the lifting gear. The auxiliary trolley moves in conjunction with the movement of the main trolley while maintaining a predetermined relative speed relationship in the same direction.However, as this interlocking means, conventionally, the main trolley and the auxiliary trolley are connected by a rope,
Alternatively, a drive system is provided for each of the main and sub trolleys. In the case of a crane with a girder and a boom connected to each other, it is dangerous if the sub trolley moves on the boom when the boom is raised and lowered, so the link between the sub trolley and the main trolley is released, and only the main trolley is free. It is necessary to be able to move on the girder. In the case of the above-mentioned rope connection, a part of the rope endlessly laid between the two pulleys of each auxiliary trolley is fixed to the girder, and The rope and the main trolley are connected to each other by a detachable connection device by frictional connection such as a pressure roller mounted on a trolley. To release the link between the main and sub trolleys, the press roller is raised by a cylinder to release the frictional connection between the roller and the rope (for example, Japanese Utility Model Laid-Open No. 63-197285).

[0003]

The above-mentioned main trolley for moving the lifting gear and the auxiliary trolley for supporting the hoisting rope are connected by frictional joining of the rope and the roller. Yes, the relative position between the main trolley and the sub trolley is out of order, so that the sagging of the hoisting rope stretched along the girder is not effectively prevented,
There is a problem that the operability of the crane is affected. Further, in this structure, since the detachable friction coupling device is provided on the main trolley, there is a problem that the weight of the main trolley increases. On the other hand, the one having two drive systems for the main trolley and the auxiliary trolley separately has no drawback as described above, but is economically inefficient, and has a drawback that the drive unit requires a large area. .

The present invention eliminates the slippage of the sub trolley by connecting the main trolley and the sub trolley with mechanical switchable means instead of friction means, and installs the mechanical fixing means on the girder. This eliminates the extra weight increase of the main trolley, thereby securing the safety at the time of the boom up-and-down and preventing the hoisting rope from hanging, and improving the operability of the crane. To provide.

[0005]

According to the present invention, there is provided a bridge type crane in which a boom is connected to the front end of a girder so as to be able to undulate, and a main trolley and auxiliary trolleys for supporting a hoisting rope are mounted on front and rear sides of the main trolley. Connecting the front and rear ends of the first rope folded back by the rear end sheave of the girder and the front end sheave of the boom to the auxiliary trolleys,
A mechanical locking device is provided for fixing the second rope folded back by the double pulleys of each of the sub trolleys to the main trolley, and fixing and releasing the second rope to the girder at a fixed position on the girder. The mechanical locking device may include the second rope.
And the front of the girder
It has a stopper that locks and releases the rope tie
A hoisting rope support device is obtained.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is an overall side view of a rope trolley type bridge crane according to an embodiment of the present invention. A girder 16 is arranged above the crane main body 4 installed adjacent to the quay from the sea side to the land side, and the boom 15 is moved up and down at a front end (sea side) of the girder 16 in series. Are linked. Sheaves 5 and 5a are provided on the main trolley 12 for moving the hanging tool traveling on the girder 16 and the boom 15, and the hoisting rope 3 drawn out from the hoisting device 1 on the girder 16 is connected to the rear end of the girder 16. Through the sheaves 2a, which are pivotally supported by the main trolley 12, through the sheaves 5, 5a of the main trolley 12, and again through the sheaves 5, 5a on the main trolley 12 through the hanging tool 14, and is pivotally supported at the boom tip (sea side). It passes through the sheave 2 and is fixed to a fixed point on the boom 15. On the front and rear sides of the main trolley 12, auxiliary trolleys 13, 1 for preventing the hoisting rope 3 from hanging down.
3a is provided. The first auxiliary trolley moving rope 8 stretched along the girder 16 and the boom 15 so that the rear end of the girder 16 and the front end of the boom 15 are folded back to the auxiliary trolleys 13 and 13a. At an upper position of 16, an appropriate tension is applied by the rope tensioning device 7, one end of which is fixed to one auxiliary trolley 13 a and the other end is fixed to the other auxiliary trolley 13 without any slack. Reference numeral 6 denotes a guide sheave for the first auxiliary trolley moving rope 8 provided at an appropriate position near the girder 16 and the end of the boom 15 and the rope tensioning device 7. Each of the auxiliary trolleys 13 and 13a has a double-moving pulley 1 respectively.
0, 10a are mounted, and these double pulleys 10, 1
One end of each of the second auxiliary trolley moving ropes 9, 9 a wrapped around 0 a is fixed to the main trolley 12, and the other end of each of the second auxiliary trolley moving ropes 9, 9 a is fixed on a girder 16 to be described later. (FIG. 3). Note that the second ropes 9 and 9a may be formed in a single body, and the rope fixing metal 17 may be fixed to this rope. The rope securing bracket 17 is fixed to the girder by a mechanical lock device 11 provided at a fixed position of the girder 16.
The fixing is released, which will be further described later.

[0007] The main trolley 12 and the sub trolley 13, depending on the hanging ratio of the first and second sub trolley moving ropes 8, 9,
The moving amount of the main trolley 12 is determined by the moving ratio of the main trolley 12 at a speed of 1/2 of the main trolley 12, and the sub trolleys 13, 13a are thereby moved. Is designed to always support the intermediate point of the hoisting rope 3 on the front and rear sides of the main trolley 12. Specifically, when the main trolley 12 is moved in one direction (for example, in the direction of arrow A) by the main trolley pulling rope 25 in a state where the mechanical locking device is working, the main trolley 12 is moved to the second sub-boom 15 side. The boom-side auxiliary trolley 13 is moved in the same direction via the trolley-moving rope 9, and therefore the girder-side auxiliary trolley 13a is moved in the same direction via the first auxiliary trolley-moving rope 8. Similarly, when the main trolley 12 moves in the reverse direction, the sub-trolleys 13 and 13a also move in the same direction as the main trolley 12 with the above-described speed relationship. Although the illustrated embodiment is an example of the rope pulling type of the main trolley 12, the main trolley 12
Needless to say, a self-propelled system in which a motor is mounted may be used.

When the second auxiliary trolley moving ropes 9 and 9a are always fixed to the girder 16 by the lock device 11, when the boom 15 is raised (the state shown by the dashed line in FIG. 1). When the main trolley 12 moves, the secondary trolley 1
3, 13a will move and the boom 15 will be inclined.
The auxiliary trolley 13 moves on the upper part and is dangerous. Therefore, in the mechanical lock device 11 according to the present invention, when the boom 15 is raised, only the main trolley 12 moves, and the sub trolleys 13 and 13 are moved.
a is second so as to remain fixed in that position.
The fixing of the auxiliary trolley moving ropes 9 and 9a on the girder 16 is released. The mechanical lock device 11 of the present embodiment will be described with reference to FIGS. Mechanical lock
The lock device 11 includes a rope tying bracket 17 and a movable stopper.
18 has a stopper portion composed of a stationary stopper 23
You. First, when the boom 15 is in a horizontal position, the rope securing metal member 17 connecting the second auxiliary trolley moving ropes 9 and 9a is fixed to the girder 16 at the end of the girder 16 on the boom 15 side. It is located between the stopper 23 and the movable stopper 18 descended along the movable stopper guide 22, and is fixed by being sandwiched between the stoppers 23, 18, so that the second auxiliary trolley movement on the boom side and the girder side is performed. The connecting ropes 9 and 9a are fixed to the girder 16 at the joints thereof, and the auxiliary trolleys 13 and 13a are moved by the movement of the main trolley 12 as described above. The movable stopper 18 has a groove 18 at its lower end for holding the first auxiliary trolley moving rope 8.
a is formed, and the upper end thereof is connected to one end of a seesaw lever 19 pivotally attached to the girder 16 via a bracket 20. The other end of the seesaw lever 19 is connected to the girder 16
Is connected to the cylinder 21 installed at the center. When the movable stopper 18 is raised by the operation of the cylinder 21 from the locked state of the rope tying member 17, the rope tying member 1
7 Therefore, the lock of the second auxiliary trolley moving ropes 9, 9a is released. When raising the boom 15 here, the second
When the lock of the auxiliary trolley moving ropes 9 and 9a is released, the main trolley 12 moves to the sea side on the girder 16 and the ropes 9 and 9a move on the side where the rope fixing bracket 17 is separated from the fixed stopper 23. 12 to rotate freely between the two pulleys 10 and 10a of the auxiliary trolleys 13 and 13a.
Is stopped on the boom 15 raised regardless of the movement of the vehicle.
With the boom 15 in the horizontal state again, the main trolley 12 and the
When linking the trolleys 13 and 13a, drive on the main trolley 12.
Then, the rope tie 17 is brought into contact with the fixed stopper 23.
After being positioned between both stoppers 18 and 23
The dynamic stopper 18 is lowered. This secures the rope
The metal fitting 17 is sandwiched between the stoppers 18 and 23 to form a girder.
16, the main trolley 12 and the auxiliary trolleys 13, 13a
Is linked. At this time, both trolleys 12, 13 and 13
The positional relationship with the girder 16 is determined by the four fixed stoppers 2
Because the mounting position of 3 is fixed,
Reproduced accurately.

[0009]

As described above, according to the present invention, by employing the rope fixing means for mechanically locking and unlocking, the conventional case of fixing by frictional joining and driving can be used.
Wrap a rope around the moving drum and secure with the drum brake
In such a case , the slippage of the rope caused by the trolley is eliminated, the displacement of the relative position between the main trolley and the sub trolley is prevented, and the hanging of the hoisting rope is reduced, so that operability and safety are improved. After releasing the main trolley, connect the main trolley and the sub trolley.
It is easy to reproduce the positional relationship between both trolleys when connecting
Yes, and the conventional fixing means by friction joining was provided on the main trolley, but in the present invention, the mechanical locking device is provided on the girder, so the weight of the main trolley does not increase, and the loading capacity is reduced. There is an effect that can be increased.

[Brief description of the drawings]

FIG. 1 is an overall side view of a rope trolley type bridge crane according to an embodiment of the present invention.

FIG. 2 is an enlarged front view of the mechanical lock device according to the embodiment of the present invention;

FIG. 3 is a sectional view taken along line BB of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hoisting device 2 Sheave 3 Hoisting rope 5, 5a Sheave on main trolley 8 First auxiliary trolley moving rope 9, 9a Second auxiliary trolley moving rope 10, 10a Double pulley 11 Mechanical lock device DESCRIPTION OF SYMBOLS 12 Main trolley 13, 13a Secondary trolley 14 Hanger 15 Boom 16 Girder 17 Rope fixing bracket 18 Movable stopper 21 Cylinder 22 Movable stopper guide 23 Fixed stopper

Claims (2)

(57) [Scope of request for utility model registration] 1. A bridge type crane in which a boom is connected to a front end of a girder so as to be able to move up and down, and a main trolley and auxiliary trolleys for supporting a hoisting rope are mounted on the front and rear sides thereof. The front and rear ends of the first rope folded back by the sheave on the front end side of the boom are connected to the auxiliary trolleys, and the second ropes folded back by the double pulleys of the auxiliary trolleys are connected to the main trolley. And the second rope is fixed to the girder at a fixed position on the girder.
Setting a mechanical locking device to release only, the mechanical locking device
Is a rope securing bracket provided on the second rope,
Lock and release the rope tying provided on the girder
That the hoisting ropes support device bridge crane, characterized in that it comprises a stopper portion. Wherein said rope lashing fittings is provided in the middle of the girder-side end and the boom end of the second rope, before
The stopper portion includes a fixed stopper provided on the girder and in contact with a boom-side end of the rope tying member to lock the rope tying member, and the rope tying member comes into contact with the fixed stopper. The winding of a bridge-type crane according to claim 1, characterized in that the bridge-type crane comprises a movable stopper that locks and releases the girder-side end of the rope tie-down fitting in a contact state. Upper rope support device.